Check storage space on logging

app/src/main/java/eu/faircode/email/EntityLog.java

@@ -39,7 +39,10 @@ import java.util.concurrent.ExecutorService;
 )
 public class EntityLog {
     static final String TABLE_NAME = "log";
-    static Long last_cleanup = null;
+
+    private static boolean ok = true;
+    private static long count = 0;
+    private static Long last_cleanup = null;
 
     private static final long LOG_CLEANUP_INTERVAL = 3600 * 1000L; // milliseconds
     private static final long LOG_KEEP_DURATION = 24 * 3600 * 1000L; // milliseconds
@@ -67,6 +70,13 @@ public class EntityLog {
         executor.submit(new Runnable() {
             @Override
             public void run() {
+                if (!ok || (++count % LOG_DELETE_BATCH_SIZE) == 0) {
+                    long cake = Helper.getAvailableStorageSpace();
+                    ok = (cake < Helper.MIN_REQUIRED_SPACE);
+                    if (!ok)
+                        ok = false;
+                }
+
                 try {
                     db.beginTransaction();
                     db.log().insertLog(entry);

app/src/main/java/eu/faircode/email/Helper.java

@@ -146,6 +146,7 @@ public class Helper {
     static final float LOW_LIGHT = 0.6f;
 
     static final int BUFFER_SIZE = 8192; // Same as in Files class
+    static final long MIN_REQUIRED_SPACE = 250 * 1024L * 1024L;
 
     static final String PGP_BEGIN_MESSAGE = "-----BEGIN PGP MESSAGE-----";
     static final String PGP_END_MESSAGE = "-----END PGP MESSAGE-----";

app/src/main/java/eu/faircode/email/MessageHelper.java

@@ -124,7 +124,6 @@ public class MessageHelper {
     private static final long ATTACHMENT_PROGRESS_UPDATE = 1500L; // milliseconds
     private static final int MAX_META_EXCERPT = 1024; // characters
     private static final int FORMAT_FLOWED_LINE_LENGTH = 72;
-    private static final long MIN_REQUIRED_SPACE = 250 * 1024L * 1024L;
 
     private static final List<Charset> CHARSET16 = Collections.unmodifiableList(Arrays.asList(
             StandardCharsets.UTF_16,
@@ -801,7 +800,7 @@ public class MessageHelper {
 
     MessageHelper(MimeMessage message, Context context) throws IOException {
         long cake = Helper.getAvailableStorageSpace();
-        if (cake < MIN_REQUIRED_SPACE)
+        if (cake < Helper.MIN_REQUIRED_SPACE)
             throw new IOException(context.getString(R.string.app_cake));
         if (cacheDir == null)
             cacheDir = context.getCacheDir();